ammidown



@nimh mi etnt @Hire IMPROVEMENT IN DB-IILING MACHINES.

M. MfAMMIDOWN, OF BOSTON, MASSACHUSETTS. l Letters Patent No. 60,114,dated December 4, 1866.

SPECIFICATION'- TO ALL WHOM IT MAY CONGERN:

Be it known that I, M. M. AMMIDOWN, of Boston, in the county of Suffolk,and State of Massachusetts, have invented a new and useful Improvementin Adjustable Platens for Upright Drills; and I do hereby declare thatthe following is a full, clear, andexact description of the same,'reference being had to the accompanying drawing, making part of myspecification, and representing a vertical section of the device.

'The object of my invention is to provide for the ready and convenientadjustment of a. platen to be used in connection with a machine fordrilling metal, by which the latter can be readily accommodated-tothe`operation of the drill as itpasses into or through the metal to beoperated upon; and the invention consists of a slotted cylindricalstandard, in which is arranged an upright screw, upon which is fitted acollar having a projection that passes through the slot in the standardand is allowed to move freely up and down in the said slot.

The said projection is fitted within a groove in an arm that encirclesthe standard by which the arm is supported,

and on which it is allowed to turn freely, and upon the arm is supportedthe platen.

Referring to the drawing, A represents the base and B the hollow slottedstandard. i The saidstandard has a longitudinal slot b b, in oneside,extending nearly its whole length. Within this hollow standard, andproperly stepped at its lower end and journalled in a cross-piece at itsupper end, is a screw, D. Upon this screw is tted a nut or collar, E,having a projection which passes throughAthe slot in the standard, andhaving an enlarge ment, e, at its outer end. Thev collar, E, has afemale screw on its inner side, which engages with'V the screw, D. Frepresents an arm which is made to encircle the standard, B, and so asto move freely thereon. It is. separated at the rear, F/and providedwith a screw by which the two parts can be clamped together, so as tohold the arm tightly upon-the standard and render it immovable whenrequired. The front part of the arm, F, extends outwards from thestandard, and bears upon its` end the platen, C, which is arranged torevolve freely on the said arm, being provided with a shoulderedcylindrical bearing, d. At the central part of the inner side of thatpart of the arm that encircles the standard, 'B, is a groove, f, inwhich `fits the enlarged projection e, of

the collar, E, which supports the said arm, and on which` it can befreely turned in a horizontal plane around the standard. At the upperend of the screw, D, is a. bevelled gear-wheel, g', engaging'with acorresponding gear-` wheel, g', to-which latter is attached a crank foroperatingthe screw, D. As the screw D isturned or operated in one or theother direction, the collar, E, together with the arm and platen, willbe elevated or lowered as desired. `In operation, the article to bedrilled is placedupon the platen, C, and, as the drill enters thexarticle, the turning of the screw serves to elevate the said article,and thus keeps itin contact with the drilluntil the process is finished.An automatic device for4 imparting simultaneous motion to the screw, D,toccrrespond to l the desired upward motion of the platen bearing ,thearticle tobe drilled, may be arranged in any convehient y p manner, ifdesirable. The rotation of the platen, (Lupen the arm, F, allows thearticle being drilled to change` i its position, or several articles maybe operated uponpwithout the necessity of removing them from .theplaten;` and the rotation of the, arm, F, on the: standard admitsof theplaten being readily removed from under the` f i drill for any necessaryor desirable purpose. The elevatingscrew, D, beingwithin the hollowYstandard, is ina i great measure protected frplix substances escapingfrom the platen, and `s` qh as would be liable to clog it,

Having thus described my invention, what I claim as new, and desirI tosecure by Letters Patent, i's- 1. The combination of the collallE,providedV with the projection e", and the grooved arm F, substantiallyas and for the'purpose specified.

2. I also claimV the combination of the slotted standard B, and screw D,with the collar E, arm F, and` platen C, asrand for the purposespecified.

3. I claim the grooved arm 'or holder F, as andfor the purposespecified.`

In testimony whereof he has signed his name-to this specification in'the presence of. two subscribing witnesses. t

M. M. AMMIDowN.

Witnesses:

G. A. CJSMITH, CHAs. F. SLnsrnn.

